JPH03283414A - Transformer - Google Patents

Abstract

PURPOSE:To facilitate the positioning and retention of a temperature fuse and the like to the prescribed position where the heat of a winding is detected by a method wherein a cavity part, to be used to provide a shutt-off means with which a circuit is turned OFF at a fixed temperature or higher, is provided in the wall which constitutes a winding-wound spool with which temperature rise is detected, a shut-off means inserting hole, one side of which is opened to a bobbin, is provided on the above-mentioned cavity part, and a cover material is attached to the bobbin. CONSTITUTION:The upper surface of the first circumferential wall 34 is thickly formed, and a cavity part 40, wherein a temperature fuse 38 (shutt-off means) is formed, is provided in the thickly formed section. A temperature fuse inserting hole 42, which passes through a protruding part 30 for plug and opened to the front end part of a bobbin 10, is provided in the cavity part 40. A cover material 12 is installed from the lower part of the bobbin 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a transformer in which a housing section is provided in the winding frame in which a temperature fuse or the like is arranged to interrupt the circuit when the winding overheats.

[Prior Art] Conventionally, a through hole is formed in the wall that constitutes the winding body of a transformer winding bobbin, and a temperature fuse is inserted into the through hole, with both ends opening to the outer surface of the collar. There is a known device that is designed to house the container (Utility Model Publication No. 53-36141).

According to this transformer winding bobbin, by inserting a temperature fuse into the through hole, contact between the temperature fuse and the winding wire is prevented and insulation is ensured, so there is no need to perform insulation work or interrupt winding work. It is possible to easily install a temperature fuse without having to worry about overheating.

[Problems to be Solved by the Invention] However, in the conventional transformer as described above, both ends of the through hole for inserting and accommodating the temperature fuse are opened on the outer surface of the collar, so the temperature fuse inserted from one side is It was easy for the fuse to fall off or be biased to the opposite side, and there was a problem in positioning the temperature fuse at a predetermined position to detect overheating of the winding.

The present invention has been made in view of the above-mentioned problems existing in the prior art, and its purpose is to provide a housing with a temperature fuse, etc. for cutting off the circuit when the winding overheats. It is an object of the present invention to provide a transformer that can easily and reliably position and hold a temperature fuse, etc. at a predetermined position for detecting overheating of a winding when it is installed.

[Means for Solving the Problems] In order to achieve the above object, the transformer of the present invention includes a winding frame and a winding wound on the winding body of the winding frame by being attached to the winding frame. A cavity is provided in the wall constituting the winding drum in which the winding whose temperature rise is detected is wound, for arranging an interrupting means that opens the circuit at a temperature above a certain temperature. The cavity is provided with a blocking means insertion port that opens on one side of the winding frame, and a lid portion that closes the blocking means insertion port by attaching the cover member to the winding frame is provided in the cavity. Provided on the cover member.

[Operation] After winding the winding wire around the winding body of the winding frame, inserting the blocking means through the blocking means insertion opening opened on one side of the winding frame and placing it in the cavity, the cover member is inserted into the winding frame. By attaching it to the winding body, the winding wire wound around the winding body of the winding frame is covered, and the shutting means insertion opening of the cavity is closed by the lid provided on the cover member.

Since the cavity is provided within the wall constituting the winding body around which the winding whose temperature rise is to be detected is wound, the blocking means disposed in the cavity is located inside the winding. That will happen. The temperature rise of the winding is detected through the material forming the wall, and when the second winding overheats to a certain temperature or higher, a circuit is opened to suppress the overheating of that winding to below a certain limit.

In addition, since the cavity has a cutoff means insertion opening only on one side of the winding frame, unlike a case where the cutoff means insertion opening is opened on both sides of the winding frame, the cutoff means can be positioned at a predetermined position where the winding temperature is to be detected. It is advantageous above.

Since the cutoff means insertion opening in the cavity is closed by the lid, the cutoff means is prevented from moving significantly from its predetermined position or falling off, making it impossible to perform the intended temperature sensing function. Furthermore, the blocking means can be easily replaced by removing the cover member.

[Example] An example of the present invention will be described with reference to FIGS. 1 to 8. Incidentally, FIGS. 1 to 8 show the main parts of the transformer of the present invention.

l○ is a winding frame for a transformer used to step down commercial AC in an adapter for converting AC to DC;
Reference numeral 12 denotes a cover member attached to the winding frame 10, and each of these members is mainly made of insulating synthetic resin.

1 to 3 show the state before the cover member 12 is attached to the winding frame 1o, of which FIG. 1 is a front view, FIG. 2 is a right side view, and FIG. at is a bottom view of the winding frame 1o, and FIG. 3 (bl is a bottom view of the cover member 12).

4 to 6 show the cover member 12 attached to the winding frame 10, of which FIG. 4 is a front view, FIG. 5 is a right side view, and FIG. 6 is a bottom view. It is.

7 and 8 are a cross-sectional view taken along the line ■-U and a cross-sectional view taken along the line lll-[[1 in FIG. 4, respectively.

In the winding frame 10, 14 is a first winding trunk for winding the secondary winding, and 16 is a second winding trunk for winding the secondary winding. The section 14 and the second winding trunk section 16 are provided in series. The first volume trunk section 14 has a front collar section 18.
The second volume trunk 16 is sandwiched between the intermediate flange 20 and the rear flange 22. 1st
An annular groove 24 that serves as a guide when attaching the cover member 12 is cut inward on the outer periphery of the intermediate collar section 20 that partitions the winding drum section 14 and the second winding drum section 16.

Reference numeral 26 denotes an iron core accommodation hole, in which the front flange 18 and the first volume body 1
4. It passes through the winding frame 10 through the inside of the intermediate flange 20, the second body 16, and the rear flange 22.

On the front upper side of the front flange 18 in the drawing, there is a brag blade 28.
A substantially rectangular parallelepiped plug protrusion 30 is provided for embedding and fixing the base of the plug. 32, a terminal forming a part of the base of the plug blade 28 and protruding above the plug protrusion 30;

The first volume trunk 14 and the second volume trunk 16 are each comprised of a first circumferential wall body 34 and a second circumferential wall body 36 each having a rectangular tube shape. The upper side of the first peripheral wall body 34 is formed into a thick part, and inside the thick part are
As shown, a cavity 40 is provided for arranging a temperature fuse 38 (blocking means). When the temperature fuse 38 is disposed in the cavity 40, the temperature fuse 38 is located inside the primary winding wound around the first winding body 14,
The temperature rise of the primary winding is detected through the synthetic resin that constitutes the thick part of the first peripheral wall 34, and when the -thirst winding overheats to a certain temperature or higher, the circuit is opened (by which the circuit is closed). - The overheating of the secondary winding is suppressed to below a certain limit. The reason why the cavity 40 is provided in the first peripheral wall body 34 is that the - secondary winding generates a larger amount of heat than the secondary winding. .In the cavity 40,
A temperature fuse insertion port 42 is provided that penetrates the plug protrusion 30 and opens at the front end of the winding frame 10. Cavity 40
Since the temperature fuse insertion port 42 is opened only at the front end of the winding frame 10, it is advantageous in positioning the temperature fuse 38 at a predetermined position where the temperature of the -th winding is to be detected.

Temperature fuse insertion port 42 on the front surface of the plug protrusion 3o
A recess 44 is formed above the recess 44, and two lead wire extraction grooves 46 are provided in the recess 44. Two lead wires 48 of the temperature fuse 38 are drawn out upward through the lead wire drawing groove 46.

Further, 50 is a guide protrusion provided on the front surface of the front flange portion 18.

52 is a terminal protrusion provided below the rear flange 22.

In the cover member 12, 60 and 62 are a front wall and a rear wall each having a substantially U-shaped flat plate shape, and 64 is an outer circumferential wall bent in a substantially U-shape. It is connected.

66 is a lid portion for closing the temperature fuse insertion port 42. The lid 66 projects upward from the base 68, and the left and right ends of the base 68 are supported by support arms 70 that project from the upper end of the front wall 60.

When assembling a transformer using this winding frame 10 and cover member 12, the primary winding is wound around the first winding trunk 14, the secondary winding is wound around the second winding trunk 16, and the temperature fuse insertion port 42 is wound with a primary winding. After inserting the temperature fuse 38 and disposing it in the cavity 40, the cover member 12 is attached from below the winding frame 10 as shown by the arrows in FIGS. 1 and 2. At this time, the inner peripheral part of the rear wall 62 of the cover member 12 is
The front wall 6 is fitted into the left, right and lower sides of the annular groove 24.
The inner edge of 0 is along the guide protrusion 50, and the rear surface of the front wall 60 is
It is brought into contact with the front surface of the front flange portion 18.

As a result, as shown in FIGS. 4 to 8.

The cover member 12 surrounds the first winding trunk 14 from the outside on three sides except for the upper part. At the same time, the temperature fuse insertion port 42 is closed by the lid portion 66. Therefore, it is possible to prevent the temperature fuse 38 from moving significantly from its predetermined position or falling off, and from being unable to perform its intended temperature sensing function. Further, the temperature fuse 38 can be easily replaced by removing the cover member 12.

[Effects of the Invention] In the transformer of the present invention, the cavity for disposing the interrupting means that detects the temperature rise of the winding and opens the circuit when the temperature rise is above a certain temperature is arranged so that the winding whose temperature rise is detected is wound. It is provided in the wall that constitutes the winding drum to be rotated, and the blocking means insertion opening is opened only on one side of the winding frame, so it is different from the case where the insertion opening is opened on both sides of the winding frame. In contrast, the inserted cutoff means does not fall off or deviate to the opposite side (and it is easy and reliable to position the cutoff means at a predetermined position where the temperature of the winding is to be detected).

In addition, since the cutoff means insertion port is opened only on one side of the winding frame, the cutoff means can be fixed by fixing the lead wires of the cutoff means pulled out from the insertion holes on both sides of the winding frame, as in the conventional case. Although it is not possible to do so, by attaching the cover member to the winding frame, the winding wound on the winding trunk is covered, and at the same time, the lid closes the opening of the cavity. This prevents the blocking means from being unable to perform its intended temperature sensing function due to large movement or falling off.

Therefore, according to the transformer of the present invention, it is possible to extremely efficiently assemble a covered transformer that can reliably suppress overheating of the windings within a certain limit.

[Brief explanation of the drawing]

1 to 8 all relate to one embodiment of the transformer of the present invention. Figures 1 to 3 show the state before the cover member is attached to the winding frame, of which Figure 1 is a front view;
Figure 2 is a right side view, Figure 3 (al is a bottom view of the winding frame,
Figure (b) is a bottom view of the cover member. Figures 4 to 6 show the state in which the cover member is attached to the winding frame, of which Figure 4 is a front view and Figure 5 is a front view.
The figure is a right side view, and FIG. 6 is a bottom view. 7 and 8 are a sectional view taken along the line ■-■ and [[[-[[], respectively, in FIG. 4. In the drawings, IO is a winding frame, 12 is a cover member, 14 is a first winding body, 16 is a second winding body, 34 is a first circumferential wall, 36 is a second circumferential wall, 38 is a temperature fuse, and 40 is a The cavity, 42 is a temperature fuse insertion port, and 66 is a lid.

Claims (1)

[Claims] It comprises a winding frame and a cover member that is attached to the winding frame to cover the winding wound around the winding body of the winding frame,
A cavity is provided in the wall constituting the winding body around which the winding whose temperature rise is detected is wound, for installing a cutoff means that opens the circuit at a temperature above a certain temperature. A blocking means insertion opening opening on one side of the winding frame is provided, and the cover member is provided with a lid portion that closes the blocking means insertion opening by attaching the cover member to the winding frame. transformer.